Default workbook

Default workbook in Microsoft Excel

By default, Microsoft Excel (all versions) creates a workbook when you start Microsoft Excel. The name of the workbook is usually Book1. If you open multiple instances of Microsoft Excel, then each of the instance would open a new workbook. The number of worksheets in the workbook depend on the option set for the number of worksheets in the default options.

Microsoft Excel doesn't open a default workbook under the following circumstances,

1. When you open a file from START->DOCUMENTS.
2. When you open a file from Windows Explorer.
3. When you download and open a file from a web browser.
4. When Microsoft Excel is set to open a default workbook when it starts.
5. When any file is stored in the XLSTART folder.

There may also other circumstances where Microsoft Excel may not open a workbook. If you experienced such circumstances, you may post in the comments section.
There seems to be no way from making Microsoft Excel not open a workbook when it starts. If you have an idea, you may post it.